From aa8bd3966617d74a2d4310f0aecdc391952fa20b Mon Sep 17 00:00:00 2001
From: ceriel <devnull@localhost>
Date: Wed, 1 Aug 1990 14:36:45 +0000
Subject: [PATCH] only leave ms_std's if prodepth > 0

---
 util/opt/backward.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/util/opt/backward.c b/util/opt/backward.c
index b6c117a5..632889e3 100644
--- a/util/opt/backward.c
+++ b/util/opt/backward.c
@@ -161,7 +161,8 @@ backward() {
 			goodrom = (rc >= 2);
 			break;
 		case ps_mes:
-			if ((int) aoff(lnp->l_a.la_arg, 0) == ms_std) {
+			if (prodepth != 0 &&
+			    (int) aoff(lnp->l_a.la_arg, 0) == ms_std) {
 				lnp->l_next = i;
 				i = lnp;
 				continue;